3.14.0a7 - Cpython — ContextQMD

.. date: 2025-04-06-23-39-47 .. gh-issue: 124111 .. nonce: 2JI7iE .. release date: 2025-04-08 .. section: macOS

Update macOS installer to use Tcl/Tk 8.6.16.

.. date: 2025-04-06-23-24-00 .. gh-issue: 131423 .. nonce: 4UcBKy .. section: macOS

Update macOS installer to use OpenSSL 3.0.16. Patch by Bénédikt Tran.

.. date: 2025-03-09-21-45-48 .. gh-issue: 131025 .. nonce: VmKQkv .. section: macOS

Update macOS installer to ship with SQLite 3.49.1.

.. date: 2025-03-28-13-22-55 .. gh-issue: 131423 .. nonce: vI-LqV .. section: Windows

Update bundled version of OpenSSL to 3.0.16. The new build also disables uplink support, which may be relevant to embedders but has no impact on normal use.

.. date: 2025-03-19-21-58-16 .. gh-issue: 131453 .. nonce: qQ4J5H .. section: Windows

Some :data:!SND_* and :data:!MB_* constants are added to :mod:winsound.

.. date: 2025-03-19-01-11-56 .. gh-issue: 91349 .. nonce: pmtp-J .. section: Windows

Replaces our copy of zlib with zlib-ng, for performance improvements in :mod:zlib.

.. date: 2025-03-09-21-45-31 .. gh-issue: 131025 .. nonce: hlS5EC .. section: Windows

Update Windows installer to ship with SQLite 3.49.1.

.. date: 2025-04-05-14-52-36 .. gh-issue: 132121 .. nonce: QNoDih .. section: Tools/Demos

Always escape non-printable Unicode characters in :program:pygettext.

.. date: 2025-03-29-16-20-00 .. gh-issue: 131852 .. nonce: afuefb .. section: Tools/Demos

:program:msgfmt no longer adds the POT-Creation-Date to generated .mo files for consistency with GNU msgfmt.

.. date: 2025-03-15-12-44-54 .. gh-issue: 131277 .. nonce: JaMlVa .. section: Tests

Allow to unset one or more environment variables at once via :meth:EnvironmentVarGuard.unset() <test.support.os_helper.EnvironmentVarGuard.unset>. Patch by Bénédikt Tran.

.. date: 2025-03-10-18-58-03 .. gh-issue: 131050 .. nonce: FMBAPN .. section: Tests

test_ssl.test_dh_params is skipped if the underlying TLS library does not support finite-field ephemeral Diffie-Hellman.

.. date: 2025-04-07-04-11-08 .. gh-issue: 131809 .. nonce: 4MBDuy .. section: Security

Update bundled libexpat to 2.7.1

.. date: 2025-03-14-23-28-39 .. gh-issue: 131261 .. nonce: 0aB6nM .. section: Security

Upgrade to libexpat 2.7.0

.. date: 2024-08-06-12-27-34 .. gh-issue: 121284 .. nonce: 8rwPxe .. section: Security

Fix bug in the folding of rfc2047 encoded-words when flattening an email message using a modern email policy. Previously when an encoded-word was too long for a line, it would be decoded, split across lines, and re-encoded. But commas and other special characters in the original text could be left unencoded and unquoted. This could theoretically be used to spoof header lines using a carefully constructed encoded-word if the resulting rendered email was transmitted or re-parsed.

.. date: 2025-04-06-23-16-08 .. gh-issue: 132174 .. nonce: dN4b-X .. section: Library

Fix function name in error message of _interpreters.run_string.

.. date: 2025-04-06-23-09-21 .. gh-issue: 132171 .. nonce: zZqvfn .. section: Library

Fix crash of _interpreters.run_string on string subclasses.

.. date: 2025-04-06-19-25-12 .. gh-issue: 129204 .. nonce: sAVFO6 .. section: Library

Introduce new _PYTHON_SUBPROCESS_USE_POSIX_SPAWN environment variable knob in :mod:subprocess to control the use of :func:os.posix_spawn.

.. date: 2025-04-06-16-12-49 .. gh-issue: 132159 .. nonce: WvBfBm .. section: Library

Do not shadow user arguments in generated :meth:!__new__ by decorator :class:warnings.deprecated. Patch by Xuehai Pan.

.. date: 2025-04-06-13-23-41 .. gh-issue: 132168 .. nonce: 6UMEpo .. section: Library

The :class:ctypes.py_object type now supports subscription, making it a :term:generic type.

.. date: 2025-04-06-09-55-43 .. gh-issue: 84481 .. nonce: cX4yTn .. section: Library

Add the :attr:!zipfile.ZipFile.data_offset attribute, which stores the offset to the beginning of ZIP data in a file when available. When the :class:zipfile.ZipFile is opened in either mode 'w' or 'x' and the underlying file does not support tell(), the value will be None instead.

.. date: 2025-04-04-16-22-03 .. gh-issue: 132075 .. nonce: qMM5np .. section: Library

Fix possible use of :mod:socket address structures with uninitialized members. Now all structure members are initialized with zeroes by default.

.. date: 2025-04-03-01-35-02 .. gh-issue: 118761 .. nonce: VQcj70 .. section: Library

Improve import times by up to 27x for the :mod:string module. Patch by Adam Turner.

.. date: 2025-04-02-16-01-12 .. gh-issue: 125434 .. nonce: EjPc7g .. section: Library

Display thread name in :mod:faulthandler. Patch by Victor Stinner.

.. date: 2025-04-02-11-31-15 .. gh-issue: 132002 .. nonce: TMsYvE .. section: Library

Fix crash when deallocating :class:contextvars.ContextVar with weird unahashable string names.

.. date: 2025-04-01-13-44-26 .. gh-issue: 131938 .. nonce: dm4Suq .. section: Library

:mod:xml.etree.ElementTree: update the error message when an element to remove via :meth:Element.remove <xml.etree.ElementTree.Element.remove> is not found. Patch by Bénédikt Tran.

.. date: 2025-04-01-11-16-22 .. gh-issue: 115942 .. nonce: 4W3hNx .. section: Library

Add :meth:threading.RLock.locked, :meth:multiprocessing.Lock.locked, :meth:multiprocessing.RLock.locked, and allow :meth:multiprocessing.managers.SyncManager.Lock and :meth:multiprocessing.managers.SyncManager.RLock to proxy locked() call.

.. date: 2025-04-01-09-20-32 .. gh-issue: 131974 .. nonce: AIzshA .. section: Library

Fix several thread-safety issues in :mod:ctypes on the :term:free threaded <free threading> build.

.. date: 2025-03-31-19-19-36 .. gh-issue: 118761 .. nonce: M0yFiZ .. section: Library

Improve the import time of the :mod:ast module by extracting the :func:~ast.unparse function to a helper module.

.. date: 2025-03-31-02-06-57 .. gh-issue: 107369 .. nonce: 8M-HVz .. section: Library

Improved performance of :func:textwrap.indent by an average of ~1.3x. Patch by Adam Turner.

.. date: 2025-03-30-19-55-10 .. gh-issue: 131792 .. nonce: NNjzFA .. section: Library

Improved performance of :func:textwrap.dedent by an average of ~2.4x, (with improvements of up to 4x for large inputs), and fixed a bug where blank lines with whitespace characters other than space or horizontal tab were not normalised to the newline. Patch by Adam Turner, Marius Juston, and Pieter Eendebak.

.. date: 2025-03-28-11-26-31 .. gh-issue: 131668 .. nonce: tcS4xS .. section: Library

:mod:socket: Fix code parsing AF_BLUETOOTH socket addresses.

.. date: 2025-03-23-18-39-07 .. gh-issue: 60115 .. nonce: AWdcmq .. section: Library

Support frozen modules for :func:linecache.getline.

.. date: 2025-03-20-08-32-49 .. gh-issue: 131492 .. nonce: saC2cA .. section: Library

Fix a resource leak when constructing a :class:gzip.GzipFile with a filename fails, for example when passing an invalid compresslevel.

.. date: 2025-03-19-20-37-07 .. gh-issue: 131435 .. nonce: y8KMae .. section: Library

10-20% performance improvement of :func:random.randint.

.. date: 2025-03-19-14-36-54 .. gh-issue: 131461 .. nonce: uDUmdY .. section: Library

Fix :exc:ResourceWarning when constructing a :class:gzip.GzipFile in write mode with a broken file object.

.. date: 2025-03-19-00-09-15 .. gh-issue: 125866 .. nonce: sIIJ5N .. section: Library

Deprecate the :mod:!nturl2path module. Call :func:urllib.request.url2pathname and :func:~urllib.request.pathname2url instead.

.. date: 2025-03-18-19-52-49 .. gh-issue: 126367 .. nonce: PRxnuu .. section: Library

Fix issue where :func:urllib.request.url2pathname raised :exc:OSError when given a Windows URI containing a colon character not following a drive letter, such as before an NTFS alternate data stream.

.. date: 2025-03-18-02-11-33 .. gh-issue: 120144 .. nonce: dBLFkI .. section: Library

Disable CALL event in :mod:bdb in monitoring backend when we don't need any new events on the code object to get a better performance.

.. date: 2025-03-17-21-35-53 .. gh-issue: 131358 .. nonce: YVZ6yo .. section: Library

.. date: 2025-03-17-18-50-39 .. gh-issue: 131325 .. nonce: wlasMF .. section: Library

Fix sendfile fallback implementation to drain data after writing to transport in :mod:asyncio.

.. date: 2025-03-17-17-11-41 .. gh-issue: 90548 .. nonce: xSPf_L .. section: Library

:func:platform.libc_ver can now detect and report the version of musl on Alpine Linux.

.. date: 2025-03-17-15-45-36 .. gh-issue: 129843 .. nonce: NPdpXL .. section: Library

Fix incorrect argument passing in :func:warnings.warn_explicit.

.. date: 2025-03-16-18-30-00 .. gh-issue: 70647 .. nonce: 1qq2r3 .. section: Library

When creating a :mod:datetime object with an out of range date a more informative error is raised.

.. date: 2025-03-16-08-00-29 .. gh-issue: 130914 .. nonce: 6z883_ .. section: Library

Allow :meth:graphlib.TopologicalSorter.prepare to be called more than once as long as sorting has not started. Patch by Daniel Pope.

.. date: 2025-03-14-12-22-02 .. gh-issue: 131236 .. nonce: HjqFq0 .. section: Library

Allow to generate multiple UUIDs at once via :option:python -m uuid --count <uuid --count>.

.. date: 2025-03-13-19-54-57 .. gh-issue: 126895 .. nonce: eJP9l0 .. section: Library

Fix :mod:readline in :term:free-threaded <free threading> build.

.. date: 2025-03-11-21-52-33 .. gh-issue: 121468 .. nonce: WsEP02 .. section: Library

$_asynctask is added as a :mod:pdb convenience variable to access the current asyncio task if applicable.

.. date: 2025-02-08-21-37-05 .. gh-issue: 118761 .. nonce: EtqxeB .. section: Library

Improve import time of :mod:locale using lazy import re. Patch by Semyon Moroz.

.. date: 2025-02-03-16-27-14 .. gh-issue: 129598 .. nonce: 0js33I .. section: Library

Fix :func:ast.unparse when :class:ast.Interactive contains multiple statements.

.. date: 2025-02-02-00-30-09 .. gh-issue: 85162 .. nonce: BNF_aJ .. section: Library

The :mod:http.server module now includes built-in support for HTTPS servers exposed by :class:http.server.HTTPSServer. This functionality is exposed by the command-line interface (python -m http.server) through the --tls-cert, --tls-key and --tls-password-file options. Patch by Semyon Moroz.

.. date: 2025-01-29-21-29-46 .. gh-issue: 129463 .. nonce: qePexX .. section: Library

The implementations of equality and hashing for :class:annotationlib.ForwardRef now use all attributes on the object. Two :class:!ForwardRef objects are equal only if all attributes are equal.

.. date: 2025-01-29-21-27-45 .. gh-issue: 128593 .. nonce: r3j4l- .. section: Library

:class:annotationlib.ForwardRef objects no longer cache their value when they are successfully evaluated. Successive calls to :meth:annotationlib.ForwardRef.evaluate may return different values.

.. date: 2025-01-24-12-30-38 .. gh-issue: 117779 .. nonce: gADGXI .. section: Library

Fix reading duplicated entries in :mod:zipfile by name. Reading duplicated entries (except the last one) by ZipInfo now emits a warning instead of raising an exception.

.. date: 2025-01-17-17-35-16 .. gh-issue: 128715 .. nonce: tQjo89 .. section: Library

The class of :class:~ctypes.Structure/:class:~ctypes.Union field descriptors is now available as :class:~ctypes.CField, and has new attributes to aid debugging and introspection.

.. date: 2024-12-18-15-51-09 .. gh-issue: 128055 .. nonce: 0c_Noq .. section: Library

Fix test.test_sysconfig.test_sysconfigdata_json when running outside the build directory (eg. after installing).

.. date: 2024-12-15-15-07-22 .. gh-issue: 126037 .. nonce: OyA7JP .. section: Library

:mod:xml.etree.ElementTree: Fix a crash in :meth:Element.find <xml.etree.ElementTree.Element.find>, :meth:Element.findtext <xml.etree.ElementTree.Element.findtext> and :meth:Element.findall <xml.etree.ElementTree.Element.findall> when the tag to find implements an :meth:~object.__eq__ method mutating the element being queried. Patch by Bénédikt Tran.

.. date: 2024-12-11-17-44-36 .. gh-issue: 127794 .. nonce: VwmRsp .. section: Library

When headers are added to :class:email.message.Message objects, either through :meth:email.message.Message.__setitem__ or :meth:email.message.Message.add_header, the field name is now validated according to :rfc:RFC 5322, Section 2.2 <5322#section-2.2> and a :exc:ValueError is raised if the field name contains any invalid characters.

.. date: 2024-11-29-00-53-28 .. gh-issue: 123599 .. nonce: vyUh2S .. section: Library

Deprecate :meth:!pathlib.PurePath.as_uri; use :meth:pathlib.Path.as_uri instead.

.. date: 2024-10-29-12-59-45 .. gh-issue: 126033 .. nonce: sM3uCn .. section: Library

:mod:xml.etree.ElementTree: Fix a crash in :meth:Element.remove <xml.etree.ElementTree.Element.remove> when the element is concurrently mutated. Patch by Bénédikt Tran.

.. date: 2024-09-25-18-45-03 .. gh-issue: 120144 .. nonce: JUcjLG .. section: Library

Add the optional backend of sys.monitoring to :mod:bdb and use it for :mod:pdb.

.. date: 2024-06-30-17-00-00 .. gh-issue: 74598 .. nonce: 1gVy_8 .. section: Library

Add :func:fnmatch.filterfalse for excluding names matching a pattern. Patch by Bénédikt Tran.

.. date: 2024-02-02-15-26-48 .. gh-issue: 114917 .. nonce: sf0GuO .. section: Library

Add support for AI_NUMERICSERV in getaddrinfo emulation

.. bpo: 17254 .. date: 2019-08-05-13-58-10 .. nonce: 11xglZ .. section: Library

Added aliases for Thai Language using Microsoft Code Pages.

.. date: 2025-03-18-15-15-16 .. gh-issue: 131417 .. nonce: lQg5aH .. section: Documentation

Mention :class:asyncio.Future and :class:asyncio.Task in generic classes list.

.. date: 2025-04-03-20-11-02 .. gh-issue: 131798 .. nonce: yhdUKW .. section: Core and Builtins

Allow the JIT to remove an extra _TO_BOOL_BOOL instruction after _CONTAINS_OP_SET by setting the return type to bool.

.. date: 2025-04-02-17-47-14 .. gh-issue: 132011 .. nonce: dNh64H .. section: Core and Builtins

Fix crash when calling :meth:list.append as an unbound method.

.. date: 2025-04-01-22-24-19 .. gh-issue: 131998 .. nonce: DvmZcT .. section: Core and Builtins

Fix a crash when using an unbound method :term:descriptor object in a function where a bound method descriptor was used.

.. date: 2025-03-31-13-25-14 .. gh-issue: 131591 .. nonce: DsPKZt .. section: Core and Builtins

Implement :pep:768 (Safe external debugger interface for CPython). Add a new :func:sys.remote_exec function to the :mod:sys module. This function schedules the execution of a Python file in a separate process. Patch by Pablo Galindo, Matt Wozniski and Ivona Stojanovic.

.. date: 2025-03-28-19-02-55 .. gh-issue: 131798 .. nonce: fNZ5-2 .. section: Core and Builtins

Allow JIT to omit str guard in truthiness test when str type is known.

.. date: 2025-03-28-18-59-24 .. gh-issue: 131833 .. nonce: v4WvWT .. section: Core and Builtins

Add support for optionally dropping grouping parentheses when using multiple exception types as per :pep:758. Patch by Pablo Galindo

.. date: 2025-03-28-07-39-10 .. gh-issue: 130924 .. nonce: l2Rbmj .. section: Core and Builtins

Usage of a name in a function-scope annotation no longer triggers creation of a cell for that variable. This fixes a regression in earlier alphas of Python 3.14.

.. date: 2025-03-27-12-40-21 .. gh-issue: 131800 .. nonce: Xq3n54 .. section: Core and Builtins

Improve the experimental JIT's ability to remove type checks for certain subscripting operations.

.. date: 2025-03-25-20-38-06 .. gh-issue: 131738 .. nonce: eCb0OQ .. section: Core and Builtins

Compiler emits optimized code for builtin any/all/tuple calls over a generator expression.

.. date: 2025-03-25-13-58-25 .. gh-issue: 131719 .. nonce: zKv98a .. section: Core and Builtins

Fix missing NULL check in _PyMem_FreeDelayed in :term:free-threaded <free threading> build.

.. date: 2025-03-24-19-38-53 .. gh-issue: 131670 .. nonce: IffOZj .. section: Core and Builtins

Fix :func:anext failing on sync :meth:~object.__anext__ raising an exception.

.. date: 2025-03-24-14-56-00 .. gh-issue: 131666 .. nonce: q0-a-b .. section: Core and Builtins

Fix signature of anext_awaitable.close objects. Patch by Bénédikt Tran.

.. date: 2025-03-20-03-45-20 .. gh-issue: 130415 .. nonce: VtJhoG .. section: Core and Builtins

Optimize comparison of two constants in JIT builds

.. date: 2025-03-13-20-23-02 .. gh-issue: 129149 .. nonce: z42wkm .. section: Core and Builtins

Add fast path for small and medium-size integers in :c:func:PyLong_FromInt32, :c:func:PyLong_FromUInt32, :c:func:PyLong_FromInt64 and :c:func:PyLong_FromUInt64. Patch by Chris Eibl.

.. date: 2025-03-10-12-08-57 .. gh-issue: 130887 .. nonce: f823Ih .. section: Core and Builtins

Optimize the AArch64 code generation for the JIT. Patch by Diego Russo

.. date: 2025-03-10-12-05-45 .. gh-issue: 130956 .. nonce: f823Ih .. section: Core and Builtins

Optimize the AArch64 code generation for the JIT. Patch by Diego Russo

.. date: 2025-03-09-09-03-24 .. gh-issue: 130928 .. nonce: gP1yKv .. section: Core and Builtins

Fix error message when formatting bytes using the 'i' flag. Patch by Maxim Ageev.

.. date: 2025-03-06-17-04-27 .. gh-issue: 130935 .. nonce: ss4lmS .. section: Core and Builtins

Annotations at the class and module level that are conditionally defined are now only reflected in __annotations__ if the block they are in is executed. Patch by Jelle Zijlstra.

.. date: 2025-03-03-20-02-45 .. gh-issue: 130775 .. nonce: fEM6T- .. section: Core and Builtins

Do not crash on negative column and end_column in :mod:ast locations.

.. date: 2025-02-28-11-29-35 .. gh-issue: 130704 .. nonce: 7RDVLE .. section: Core and Builtins

Optimize LOAD_FAST and its superinstruction form to reduce reference counting overhead. These instructions are replaced with faster variants that load borrowed references onto the operand stack when we can prove that the reference in the frame outlives the reference loaded onto the stack.

.. date: 2025-02-21-14-47-46 .. gh-issue: 88887 .. nonce: V3U0CV .. section: Core and Builtins

Fixing multiprocessing Resource Tracker process leaking, usually observed when running Python as PID 1.

.. date: 2025-02-21-00-12-24 .. gh-issue: 130115 .. nonce: mF-rP6 .. section: Core and Builtins

Fix an issue with thread identifiers being sign-extended on some platforms.

.. date: 2025-02-15-14-36-32 .. gh-issue: 99108 .. nonce: u6CfmK .. section: Library

Add support for built-in implementation of HMAC (:rfc:2104) based on HACL*. Patch by Bénédikt Tran.

.. date: 2025-02-13-19-07-54 .. gh-issue: 130080 .. nonce: IoJpuy .. section: Core and Builtins

Implement PEP 765: Disallow return/break/continue that exit a finally block.

.. date: 2025-02-09-09-54-37 .. gh-issue: 129900 .. nonce: GAGGPn .. section: Core and Builtins

Fix return codes inside :exc:SystemExit not getting returned by the REPL.

.. date: 2025-01-11-20-11-28 .. gh-issue: 128632 .. nonce: ryhnKs .. section: Core and Builtins

Disallow __classdict__ as the name of a type parameter. Using this name would previously crash the interpreter in some circumstances.

.. date: 2025-01-09-22-12-03 .. gh-issue: 126703 .. nonce: 6rAxZ7 .. section: Core and Builtins

Improve performance of builtin methods by using a freelist.

.. date: 2025-01-08-09-41-25 .. gh-issue: 126703 .. nonce: djs9e_ .. section: Core and Builtins

Improve performance of :class:range by using a freelist.

.. date: 2025-03-26-06-56-40 .. gh-issue: 131740 .. nonce: 9PdxxQ .. section: C API

Update PyUnstable_GC_VisitObjects to traverse perm gen.

.. date: 2025-03-20-17-14-29 .. gh-issue: 131525 .. nonce: n8Di6a .. section: C API

The PyTupleObject now caches the computed hash value in the new field ob_hash.

.. date: 2025-03-31-19-22-41 .. gh-issue: 131865 .. nonce: PIJy7X .. section: Build

The DTrace build now properly passes the CC and CFLAGS variables to the dtrace command when utilizing SystemTap on Linux.

.. date: 2025-03-27-01-21-50 .. gh-issue: 131675 .. nonce: l2zfOO .. section: Build

Fix mimalloc library builds for 32-bit ARM targets.

.. date: 2025-03-25-19-14-24 .. gh-issue: 131691 .. nonce: 2BgHU5 .. section: Build

clang-cl on Windows needs option /EHa to support SEH (structured exception handling) correctly. Fix by Chris Eibl.

.. date: 2025-03-15-12-32-56 .. gh-issue: 131278 .. nonce: 1nd0mJ .. section: Build

Add optimizing flag WITH_COMPUTED_GOTOS to Windows builds for when using a compiler that supports it (currently clang-cl). Patch by Chris Eibl.

.. date: 2025-03-11-19-06-50 .. gh-issue: 130213 .. nonce: _eQr0g .. section: Build

Update the vendored HACL* library to fix build issues with older clang compilers.

.. date: 2025-03-06-20-55-34 .. gh-issue: 130673 .. nonce: T3RSCI .. section: Build

Fix potential KeyError when handling object sections during JIT building process.